National Grid is encouraging drivers travelling in and around Somerset to allow extra time for their journeys as it prepares to close several stretches of the M5 to install wires on a section of newly constructed T-Pylons. The work is being undertaken as part of the £900 million Hinkley Connection Project – a new high-voltage transmission line between Bridgwater and Avonmouth – which last month saw the energisation of the first 36 T-Pylons between Bridgwater and Loxton.